      PROGRAM AT_GCM
C--
C--   Main program : AT_GCM
C--
C--   Modified common blocks: DATE1
C--
C--   This main program is for code-validation.
C--   It integrates the model for only one step using 
C--   the RK4 scheme                2012/11/29 DH
C--
      include "atparam.h"
      include "atparam1.h"

      include "com_tsteps.h"
      include "com_date.h"

      PRINT *, ' Hallo from AT_GCM'

C--   1. Initialization of all model constants and variables 

      CALL INIALL

C--   2. Integrate onestep using RK4
      CALL STEP(1,1, 4*DELT, ALPH, 0)

C--  3. Output to file
      CALL IOGRID(4)

      STOP
      END
